I imagined a completed UQ shell - baffled and all - with no down in it.
You would then just slide your down-filled tubes into the baffles.
I also don't know how well a drawstring would keep the down in the tubes. I think I would go with a permanently sewn filled down tube and a baffled UQ "shell". Then you would have different "tube sets" you would have with different amounts of down in them to slip in the shell.
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